QTime - Add public api for get/set msecs since start of day

Add new public api to get and set the number of msecs since the start
of the day.  Modify QDateTime to use the new msecs api.

[ChangeLog][QtCore][QTime] Added new methods fromMSecsSinceStartOfDay()
to create a new QTime from an msecs value, and msecsSinceStartOfDay()
to return the QTime as the number of msecs since the start of the day.

Change-Id: I285b725b883f1f5524fda87ca81bd64ed99fe6f4
Reviewed-by: Lars Knoll <lars.knoll@digia.com>
Reviewed-by: Mitch Curtis <mitch.curtis@digia.com>
QMessageBox - move margins to a left spacer

This patch moves labels indent and contents margins into a
left spacer, and it only puts the iconLabel in the layout
if there is an icon.

Change-Id: I6f3563a08fc15ec6ec267e095adf1734f7828355
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>